Flash-light battery



Jan. 3, 1928. l 1,654,823

W. R. MILLAR FLASH LIGHT BATTERY Filed Jan 1. 1 27 bzzrsniar WEM'llar Patented Jan. 3, 1928.

} UNITED STATES WILLIAM ROBERT MILLAB, OF PALMERSTON, ONTARIO,

rL'AsH-menr BATTERY.

Application filed January 21, 1927. Serial No. 162,584.

My invention relates to improvements in flash light batteries, and the object of the invention is to devise a battery of this type having a long life through not being subjected to polarization, in which gases are accommodated and the'voltage maintained approximately constant and therefore a steadicr light provided, in which the batter is so constructed that it can be readily sea ed, in

which the outer battery casing is protected from corrosion so that there is no danger of bursting when left in an exhaustive condition rendering it almost impossible to be re moved from the flash light, in which the battery is so constructed that the metallic casing 'has'no electrical contact with the battery elements, in which there is no danger of leakage at any time, and it consists essentially of the arrangement and construction of parts as hereinafter more particularly explained. a

Fig. 1 is a sectional view through a flash light showing my battery in position.

Fig. 2 is an enlarged sectional view through a battery constructed in accordance with my invention.

Fig. 3 is a sectional view taken at right angles to that shown in Figure 2. 0 In the drawing like characters of referfigure; I

1 indicates a flash light of ordinary construction. 2 indicates my battery which is inserted in the flash light in the usual way. The batter heads 3 an 4: from which negative and positive plates 3 and 49 respectively extend, such plates being formed integral with the heads. The upper head 3 is provided with a vent orifice 3 provided with a screw plug 5. The heads 3 and 4 are provided in their periphery with annular grooves 6 and 7.

. 8 is a flexible sheet rubber casing fitting at its end over the heads 3 and 4 so as to enter the grooves 6 and 7. The rubber casing 8 is normally in a contracted position as clearly indicated in Figure 2 adjacent to each side of the plates 3* and 4". The rubber casing -8 is secured to the heads 6 and 7 by means of a winding 8 and 8 of rubber treated silk thread which is wrapped around that portion of the casing 8 extending around the heads 3 and 4:.

9 is an outer metallic casing fitting around the heads 3 and 4 and the surrounding casing casing 8 and at its ends around the ence indicate corresponding parts in each 2 comprises upper and lower 3 windings 8 and 8, the metal being forced into the annular grooves 6 and 7 as indicated at 9 and 9 thereby providing a sealed joint, and at the same time insulating the outer casing from the plates 3 and 4*. The casing 9 is provided with a small orifice 10 so that atmospheric pressure is' maintained Within the space 11 intervening between the casing 9 and easing '8. This space is partially filled with absorbent material such as absorbent cotton, 10*, about ten percent of such space being thereby occupied and which serves to absorb any of the active fluid which may leak through the rubber casing 8 if it should at any time deteriorate.

12 is a metallic cap preferably formed of sheet aluminum and filled with absorbent material such as blotting paper so that any of the electrolyte which may creep or spray during charging on the surface of the head 3 from corroding the spring contact or other parts which it might efi'ect.

From this description it will be seen that I have devised a very simple construction of battery which is in the form of a storage battery and therefore will not depreciate through polarization, which occupies the same space occupied by an ordinary flash light battery, which will not become corroded .by the leaking of the electrolyte, in which the voltage will be maintained practically constant, and in which there is no electrical contact between the elements of the battery and the exterior metallic casing.

What I claim as my invention is:

1. A flash light battery comprising an 'u per and lower head, positive and negative p ates each formed integral with the corresponding head and extending from opposite ends of the battery, a casing formed of flexible liquid proof material surrounding the heads at each end adapted to expand by gas pressure created within the battery during discharge.

2. A flash light battery comprising an upper and lower head, positive and negative 7 plates each formed integral with the corresponding head and extending from opposite ends of the battery, a casing formed of flexible sheet rubber extending around the heads at each end and between the heads to surround the plates.

3. A flash light battery comprising an upper and lower head, positive and negative plates each formed integral with the corresponding head and extending from opposite ends of the casing surrounding and extending between the heads, means for insulating the outer casing from the heads, and meansfor protecting the outer casing from the corrosive action of the electrolyte within the battery.

4. A flash light battery comprising an upper and lower head, positive and negative plates each formed integral with the corresponding head and extending from opposite ends of the battery, an exterior metallic casing surrounding the heads, and an inner flexible casing of insulating material interposed at its ends between the heads and the outer casing.

5. A flash light battery comprising an upper and lower head, positive and negative plates each formed integral with the corresponding head and extending from opposite battery, and an exterior metallic casing surrounding the heads, an inner flexible casing of insulating material interposed at its ends between the heads and the outer casing, a filling of absorbent material located in the intervening space between the metallic casing and the inner casing.

6. A flesh light battery comprising upper and lower heads each provided with an annular peripheral groove, battery plates carried by the heads and extending in opposite directions longitudinally of the battery, a rubber casing fitting at its ends around the heads so as to enter the grooves, an outer metallic casing having that portion thereof, surrounding the heads and the rubber casing, pressed into the grooves of the heads.

7 A flash light battery comprising upper and lower heads each provided with an annular peripheral groove, battery plates carried by the heads and extending in opposite directions longitudinally of the battery, 2. rubber casing fitting at its ends around the heads so as to enter the grooves, an outer metallic casing having that portion thereof, surrounding the heads and the rubber casing, pressed into the grooves of the heads, and a packing of rubberized silk thread interposed etween the ends of the rubber casing and the metallic casing surrounding the heads.

8. In a flash light battery, the combination with the heads thereof, one of which is provided with an orifice, and the plates and casing carried by the heads, of a closure plug for the aforesaid orifice, a metallio cap extending over the plug and provided with downwardly projecting portions bearing upon the head of the casing.

WVILLIAM ROBERT MILLAR. 

